Capgemini Java Developer Interview Questions, Process, and Tips for Experienced

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Q-Given a 2D array of strings, find the max avg grade. and round off the neaest floor integer

Q1. First round is technical round, questions were asked on basic as well as advanced concepts of java
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Q2. Also two coding questions of medium level were asked to be done.
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Q1. Create a singleton class in Java
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Singleton class in Java ensures only one instance of the class is created
• Create a private static instance of the class

• Private constructor to prevent instantiation

• Provide a public static method to access the instance
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Q2. What are solid principles
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SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses with...read more
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Q3. Write a code to remove duplicate number from list
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Code to remove duplicate numbers from a list in Java
• Create a Set to store unique numbers

• Iterate through the list and add each number to the Set

• Convert the Set back to a list to get the list without duplicates
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Q4. Exception handling in spring
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Exception handling in Spring allows for graceful handling of errors and exceptions in a Spring application.
• Spring provides a centralized way to handle exceptions using @ControllerAdvice annotation.

• You can define custom exception classes and handle them using @ExceptionHandler annotation.

• Global exception handling can be configured using @ExceptionHandler and @ResponseStatus annotations.
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Q1. Explain OOPS Concepts in detail with examples
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OOPS concepts revolve around the principles of Encapsulation, Inheritance, Polymorphism, and Abstraction in object-oriented programming.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class). Example: Class Car with properties like make, model, and methods like start(), stop().

• Inheritance: Allows a class to inherit properties and behavior from another class. Example: Class Truck in...read more
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Q2. Spring boot and Spring REST annotations
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Q3. Workflow in a Spring boot appln
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Workflow in a Spring Boot application involves defining the sequence of steps and actions to be executed.
• Define the sequence of steps using Spring's @Bean annotation

• Use Spring's @Autowired annotation to inject dependencies

• Utilize Spring's @Service annotation to mark classes as service components

• Implement business logic in service classes

• Use Spring's @RestController annotation to create RESTful APIs
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Q1. Java 8 questions
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Q2. Microservice questions
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